I have a RIA GI that I have ran just over 100 rounds through. I have found that even with ball ammo, the first round will dive into the feed ramp and not chamber if I pull the slide back to chamber. If I release the slide lock, it will usually chamber, but sometimes it won't. This happens when the mag is full. If I run 4-5 rounds in the mag, I don't have any problems. I called RIA and they told me to run 500 rounds through for break in, running only 5rds at a time in the mag. I have read on here where some people run the same pistol out of the box with zero problems. I found similar threads on other sites where the mag was to blame. A Wilson 47 d or mccormick mags fixed the problem. Others said to polish the feed ramp. Has anyone on here had these problems or know what's going on? btw I'm using the stock ACT mag.